If you like the picoSYNTH aesthetics I've also made a 3D modeller with similar looks that might be interesting to check out: https://johanpeitz.itch.io/picocad
Nothing I've made has ended up on Hacker News before so I'll also take the opportunity to shamelessly plug my Patreon if someone want to support my work. :D https://www.patreon.com/johanpeitz